Disable ShelfView Touch Feedback tests

Disable ShelfView Touch Feedback tests

ShelfViewTest.AppListButtonTouchFeedback and ShelfViewTest.AppListButtonTouchFeedbackCancellation are both failing on Valgrind after the refactor of the feedback switch. The tests does not have a memory failure, the test cases are failing now.

Disabling the tests until they can be fixed.

This is a follow up to: https://codereview.chromium.org/580903003/

TBR=skuhne@chromium.org
BUG=398398
Committed: https://crrev.com/e385a899e76dc817d02cbe5ee62d60197fc88034
Cr-Commit-Position: refs/heads/master@{#297321}

[jonross, 2014-09-29 23:52:20]

The CQ bit was checked by jonross@chromium.org

[commit-bot: I haz the power, 2014-09-29 23:53:45]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/616703002/1

[commit-bot: I haz the power, 2014-09-30 00:56:46]

Committed patchset #1 (id:1) as f580c221e61114e2367d1fd14fc2e2ae6aadbc27

[commit-bot: I haz the power, 2014-09-30 00:57:34]

Patchset 1 (id:??) landed as
https://crrev.com/e385a899e76dc817d02cbe5ee62d60197fc88034
Cr-Commit-Position: refs/heads/master@{#297321}